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4x+9x-8x=6+4

We move all terms to the left:

4x+9x-8x-(6+4)=0

We add all the numbers together, and all the variables

4x+9x-8x-10=0

We add all the numbers together, and all the variables

5x-10=0

We move all terms containing x to the left, all other terms to the right

5x=10

x=10/5

x=2

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